Possible bad power supply?

Hey guys,

I recently noticed my windows 7 installation has a lot of random issues that sfc /scannow was unable to fix. Today I decided to go ahead and try the windows repair by reinstalling with the upgrade feature. I kept on running into issues during reboot. Whenever windows installation decides to restart I would get the black screen (no signal going to monitor) right after the windows logo. Everything else seems to be running I can hear fans and hdd activities. Hitting reset will reboot and take me back to the black screen after the windows logo. The only way I'm able to get around this is too shutdown completely and turn it back on. Once I got back into windows, I tried restarting a few times and the same black screen comes up, full shut down and turning it back on, no problem. I never noticed this issue before since computer is on 24/7 and I rarely restart.

After researching black screen solutions nothing helped, one of the solution is to do a repair which I can't get it to go. I figured something could be bad in the BIOS, went into BIOS played around for about 15 second, computer rebooted. I could not do anything in the BIOS for more than a few seconds without it rebooting, even though I can boot to the OS if do a full shutdown.

I'm guessing that the power supply maybe weak and can't handle the initial load of the system during boot. So I decided to disconnect all case fans, peripherals, extra harddrives, basically only the essentials are left connected. BAM everything booted normally, I can restart, and windows repair is actually running. Is this a power supply issue or is it something else I've overlooked?

coolermaster 750watt
core i7 930
gigabyte x58
radeon hd5870
18gb ram

tl;dr black screen on restart, disconnected all unnecessary hardware everything seems fine
5 answers Last reply
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  1. 18gb ram < Don't you mean 16?
  2. SR-71 Blackbird said:
    18gb ram < Don't you mean 16?

    18, triple channel, 3x2 with 3x4
  3. Sweet ^
  4. What model Coolermaster ?
  5. iknowhowtofixit said:
    My money is on the RAM being the issue. Why dont you try the process of elimination? Just add one thing at a time until you get a failure. Then see if you can narrow it down to one component. 750W is plenty, depending on which CoolerMaster PSU you have.

    What is the exact model of your PSU?

    CoolerMaster Real Power Pro 750W http://www.newegg.com/Product/Product.aspx?Item=N82E16817171024

    Didn't think about the RAM, I'll run some memtest tonight. Also, windows repair finished windows is up and running installed all updates did a few restarts everything seems fine with extra disconnected. Reconnected everything restarted a few more times, no black screen, don't know if it was a fluke or not.
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